Man PN 121751 Rev 20170617
3
Service Mode
is entered by holding any two of the buttons on the face of the machine while powering up the brewer.
The brewer firmware revision number is displayed for a couple of seconds when entering this mode. The table below
list the items that may be programmed along with available values or settings. Use the center brew button to
advance through the items and the left and right button to decrement or increment the values/selection respectively.
These items are programmed at the factory and will typically not need adjustment. For coffee only brewers (no 2
nd
valve) ignore the dilution calibration and cold calibration volume. Use the center button to advance through those
items.
Item Selected
Screen
Example
Values
Available
Comment
Water Temperature
200
170-205
Degrees F
Pulse Heating
New in version 2 of
121753 control board
Off
On, OFF
Must be OFF for mechanical relay. May be on or off for solid
state relay, on is preferred. If brewer has a heat sink on the
back, this indicates it has a solid state relay for tank heater.
End of Cycle Beeper
On
On, OFF
Used to audibly indicate brew cycle has completed with a
series of beeps.
Brew Pump Speed
b:05
1-10
Pump speed used for brewing
Not Used
F:05
2-10
No effect. Unused feature.
Pump Calibration
CAL
N/A
See instructions below.
Must be done if pump speed
modified.
Hot Calibration Vol
39.0
25.0-99.9
Ounces. Only displays if calibration cycle was run.
Dilution Calibration
CLd
N/A
Press left or right button to run dilution valve calibration.
Cold Calibration Vol
24
20-150
Ounces delivered during cold water dilution.
Water Fill Flow Rate
0.30
Off, 0.05-1.40 Adjustable in increments of .05 GPM. Should match flow rate
through valve.
Water Filter Capacity
100
Off, 500-2500 In tens of gallons. 50=500 gallons. Increments are 500
gallons.
Power Mode
nor
nor, SAV, dn
Normal, Power Down, or Power Save.
Power Down/Save
Time
4:00
OFF, 0:30-
4:00
Hours:Minutes from last brew until brewer enters the selected
power mode. No effect if mode is “Off”.
Brew Counter
0-999
N/A
Shows number of brew cycles since last reset (up to 999).
Service Data
Srv
N/A
Used to view temperature & probe data. See
Service Data
below.
Exit
End
N/A
Use left or right button when displayed to exit this mode.
Pump Calibration:
Pump calibration is necessary when the pump speed is changed or if the brewer is delivering substantially more or
less beverage than what it has been programmed for in the user mode. Pump speed may be adjusted up or down if
required to deliver water at a faster or slower rate to meet a specific beverage taste profile. Calibration tells the
brewer control how much hot water is delivered within a specific time frame so it can adjust the time required to run
to deliver the desired brew volumes.
Ensure the brew basket is in place. Place a suitably graduated container in place below the brew basket to capture
and measure the water delivered. To calibrate, enter the service mode as noted above and advance to the “CAL”
screen. Press either the left or right brew button and water delivery will begin. If the brewer has not reached
operating temperature, it will finish heating before automatically starting. The pump will cycle on and off for
approximately 2 minutes at which time the currently programmed volume is displayed. Use the left and right button
to decrement or increment the value to the measured value. For better accuracy, you may want to measure a couple
of cycles and average the measured values. At the least, the system should be primed before calibration by allowing
a partial brew cycle to run (10-15 secs).
Note: User mode will be entered automatically when exiting the service mode if calibration values have been
changed.
